Revolving and swiveling chair adjustment.



H. W. BOLENS.

REVOLVXNG AND SWlVELING CHAIR ADJUSTMENT. APPLICATION FILED SEPT.21,1915.

1,245,182. Patented Nov. 6, 1917.

INVENTOR,

A TTORNEYE 7ilNtTEE era" HARRY W. BQLENS, OF PORT WASHINGTON, WISCONSIN.

REVOLVING AND SNIVELI'NG CHAIR ADJUSTMENT.

Specification of Letters Patent.

7 Patented Nov. 5, 1917..

Application filed September 21, 1915. Serial No. 51,783

To all whom it may concern:

Be it known that I, HARRY W. BoLnNs, a citizen of the United States, residing at Port Washington, in the county of Ozaukee and State of Wisconsin, have invented a new and useful Revolving and swiveling Chair Adjustment, of which the following is a specification. I I

My invention relates to improvements in adjustments employed in revolving and swiveling chairs, the conventional or usual type of which comprises .in its make-up, a metal hub, which may be either cast or struck-up from sheet-steel, and from which radiatethe usual legs, the hub and attached legs forming the chair-base. In said con ventional or usual type of chair, the hub is bored and receives a post. or standard, threaded throughout its length, and having a longitudinal groove extending to its lower end, the groove of the post receiving a spline onflwhat; is. termed the J-washer. At the upper end of the post is located the stretcher or spider, the connectionbetween the two being permanent and necessarily rigid and secure. The J-washer encircles the'post and is mounted on the upper end of'the hub, which endmay be formed thereat to constitute a 'bearing or to receive a thrust ball bearing washer, as the case maybe, ,The upper side of the J-washer is usually provided with a plurality, of radiating ;shallowgrooves designed to removably engage corresponding ribs formed in the underside of the hub of the hand-wheel, the threads of the latter engaging the threads of the post or standard immediately above the aforesaid lwasher. In this construction, to change heights of the chair-seat, the chair is held by one hand while the hand-wheel is rotated. The d-washer being stationary with the screw, the shallow ribs on the underside of the hub of the hand-wheel glide over the grooves in the upper side of the J-washer, When the chair is occupied the weight of the occupant causes the ribs of the handwheel to become locked or engaged with the depressions or grooves of the J-washer and the chair revolves in the bearing on the top of the hub. Thus far I have described one well-known type of chair adjustment, and it is to this particular style of adjustment that my invention is peculiarly applicable and desirable, for the reason that, the base and remainder of the chair being shipped disconnected and with the J-washer loose on the post, or attached to some part of the chair, the said J-washer isapt to and frequently does drop offend become lost, so that when the chair is put together or assembled it will not work properly by reason of the omission of this important part. Moreover, many times, even when the J- washer is not lost, it is improperly applied. That is to say, it will be inac vertently applied to the post reversely to what it should be, so that its grooves will be on its unden side instead of its upperside where they, are in position to-coact with the corresponding ribs on the underside of the superimposed hand-wheel.

The objects of my invention are to overcome. these objections, and the invention consists, first, in preferably threading the post only at that portion thereof which cooperates with the thread of thehand-wheel, that is, above the base, thus leaving-a plain cylindrical unthreaded portion of the lower half oft-he post, which uniformly conforms to and iitsfthe hub and which being unthreaded will not. unduly wear the. same; and, second, in terminating the groovein the post at it-POlIlt below that occupied by the cl-washer and short of the lower end of the post so that-the washer and hand-wheel having been positioned properly and relatively onthe post and the stretcher permanently secured at the upper end' of the post, avseparation and consequent. loss of these parts is impossible.

Referring to the drawing Figure 1 is a vertical longitudinal sectional view of a chair-base embodying my improvements; and,

Fig. 2 is a detail view in plan of the J- washer.

Fig. 3 is an inverted plan view of the hand-wheel.

Similar numerals of reference indicate similar part in both figures of the drawing.

Referring to the drawing in detail, 1 designates the hub, which is bored throughout its length as at 2.

Within the hub is located the post or standard 6, and it will be noted that the upper portion thereof, or so much thereof as coacts with the hand-wheel, is threaded, whereas the lower portion is unthreaded and merely plain and cylindrical, as at 7, and neatly fits within the hub.

Being thus unthreaded, the post will exert a minimum amount of wear upon the interior of the hub contrary to the usual custom of these parts. The post, it will be observed, is provided with longitudinal groove 8 extending from its upper end and terininates hart of the lower end thereof. linabove the upper end of the hub 11g th on or it may be upon some ini'ern'iediary antiiriction washer, is the washer 9, usually termed the d-washer, and the $211116, it will be noted, is provioed with a plain bore to receive the post and with an internal spline 10, fitting the groove of l e post. [above the dovashezzr is located the l1ilii(l-\\'l1(3t5l 11, the hub 12, of which is internally threaded to count with the threads of the post. Upon its underside the hub of the wheel may e provided with'shallow radiating ribs 13, and the latter correspond with shallow grooves 1 t, formed on the upper. mile of the J-washer, the ribs and grooves reacting in the manner heretofore indicated. Above the handwvheel may be securely and permanently fastened to the post preferably by heading or upsetting the upper end of-the post, at i, (see dotted lines) any well-known form of spreader.

The result of this arrangement is, that the i -washer as well as the hand-wheel cannot after having been placed upon the post or standard and the stretcher permanently attached, become lost therefrom during shipnient, nor can it be improperly positioned thereon, but these parts are always safely confined in proper position with relation to each other so that when the post or standard is mounted in the ehair-base these parts are bound to be present and operative.

Having thus described my invention, what I claim, is:

1. In a chair-adjustment, the combination with a bored hub, of a post mounted there-- 1 with a boref hub ot' a post having its upper a .cal to apn'oxiinately fit the bore of the hub, said post terminating at its upper end in an enlargement forming a stop and having a longitudinal groove extendi from its upper end and terminating short of the lower end thereof, a itwasher fitting the post and having a spline fitting the groove thereof and irremovable from the post, a hand-wheel threaded on the post above the washer, and means betweenthe hub oi the hand-wheel and the upper side of the J--washer whereby the two may be renio vably on d.

2-3. in a chair-adjustnient, the combination with a hub having a bore, of an adjusting post swiveled therein and having that portion of its length above the hub threaded and below the thread having a p'lainoylina drical "portion bearing in the bore ofthe hub.

ln testimony whereof, I have signediny name to this specification in the presence of two subscribingwitnesses.

HARRY W. BOLENS.

ll itnesses E. ELLIS,

i S. DUVALL.

fiopies-ot this patent may be obtainedior five cents each, by addressing the Gommissicner ofiiEatents,

Washington, 3.10.

l ade l and its lower portion plain 

